Effect of turbulent–laminar flow transition on degradation of de-NOx catalyst

Tanno, Kenji; Makino, Hisao; Kurose, Ryoichi; Komori, Satoru; Shimada, Hiroshi; Hwang, Seung-Min

doi:10.1016/j.fuel.2009.03.028

Cited by 8 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most probably, k c also varies along the channels of a used catalyst, as the various deactivation mechanisms at stake do not necessarily occur in a homogeneous way through the whole catalyst [15]. It can however be considered constant for a new catalyst.…”

Section: Catalytic No X Reduction and Catalyst Activitymentioning

confidence: 99%

“…Temporal fluctuations of the conversion at the outlet were however observed. Tanno et al [15,22] used Laser-Dopler Velocimetry (LDV) in a wind tunnel and Direct Numerical Simulation (DNS) to study the impact of the turbulent-laminar flow transition on the degradation and on the efficiency of deNO x catalysts used in thermal power plants. The studied catalysts presented larger channels than those modelled by Ström et al for automotive applications, which made the system more sensitive to the impact of inflow turbulence [20].…”

Section: Variable Mass Transfer Coefficients In Developing Flowsmentioning

confidence: 99%

“…Based on the latter experimental and DNS results [15,22], we will here consider that turbulence can have a non-negligible impact on mass transfer in the entry zone of deNO x catalysts used in power plants, and should be considered when assessing the role of mass transfer in the overall activity of a catalyst sample.…”

Section: Variable Mass Transfer Coefficients In Developing Flowsmentioning

confidence: 99%

“…as a function of the Schmidt number), no correlation is available for the cases where a transition from a turbulent to a laminar flow occurs in the entry zone of the catalyst. The effect of turbulence can however not be avoided in practical applications, both in full-scale and lab-scale conditions [12,3,15,21,14], and this effect is expected to be more pronounced for catalyst samples presenting a low non-dimensional length L * ( LD d 2ū ), i.e. for reduced lengths and/or high velocities.…”

Section: Variable Mass Transfer Coefficients In Developing Flowsmentioning

confidence: 99%

See 3 more Smart Citations

A semi-empirical method to quantify the impact of mass transfer on lab-scale SCR deNOx catalyst activity testing

Blondeau

Coppieters

Mercier

2020

Chemical Engineering Science

View full text Add to dashboard Cite

Industrial denitrification catalyst monoliths are regularly tested in controlled lab-scale conditions to quantify their activity. As mass transfer phenomena occurring inside the channels of the monoliths have an important impact on the global denitrification kinetics, activity measurements must be conducted in wellknown conditions in terms of sample geometry and gaseous flow regimes, among others. The lack of accurate mass transfer correlations for the complex flows at stake however prevents any accurate generalisation of the test results. In this paper, we propose a semi-empirical method for the quantification of contribution of mass transfer to the global denitrification kinetics for any given test bench. It is based on the experimental adjustment of mass transfer correlations presenting a suitable form. Mass transfer can therefore be decoupled from the intrinsic kinetics and large ranges of conditions can be covered by conducting a limited number of measurements.

show abstract

Section: Catalytic No X Reduction and Catalyst Activitymentioning

confidence: 99%